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DAL1889 Diverts, Hail Damage

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DAL1889 Diverts, Hail Damage

Old 8th Aug 2015, 04:16
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DAL1889 Diverts, Hail Damage

Delta 1889 BOS-SLC diverts to DEN after flying through hail storm.

Tweet from passenger showing damage to front of the plane:
https://twitter.com/rwessman/status/629852479547531268

Story:
http://abcnews.go.com/US/delta-plane...ry?id=32964286


Last edited by Subphase; 8th Aug 2015 at 16:20.
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Old 8th Aug 2015, 17:11
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Wow, you get some nasty weather over there
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Old 8th Aug 2015, 20:38
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Extraordinary nose and Windows damaged and engine and wing pristine.
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Old 8th Aug 2015, 20:51
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Even if the engines look pristine, a full inspection of the fan, and a borescope inspection of the compressor section are in order.
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Old 8th Aug 2015, 21:01
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I would like to hear from the crew their advice on making a successful landing and taxi in. Did they make an autoland etc? We can all learn something.
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Old 8th Aug 2015, 21:48
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Sure can, avoid thunderstorms.
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Old 8th Aug 2015, 22:13
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Thats another Delta aircraft completely by flying through a TS.
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Old 8th Aug 2015, 22:24
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At least some of the news reports indicated that the aircraft "flew through" a thunderstorm, but looking at at the Flightaware track of this flight, it appears they did not fly through any cells. They diverted along the south side of a line of level 6 storms extending from northeastern Colorado into Kansas and Nebraska.

Not far enough south evidently. Intense hail is a real possibility beneath the anvils of supercell thunderstorms - even many miles from the main core of the cells.
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Old 8th Aug 2015, 23:19
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Rat, According to the ATC traffic, the pilots requested autoland...
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Old 9th Aug 2015, 03:07
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Is that a hailstone actually embedded in the dent in the crunched radome? I can't think of any part of the radar kit that normally looks like a rock.

They do (very rarely) get that big in our Great Plains supercells. Largest actually documented (so far) was about 8"/200mm, even after some melting before recovery.

NOAA - National Oceanic and Atmospheric Administration - Monitoring & Understanding Our Changing Planet

As someone who lives in Denver, I can attest that it is quite common in this area to get hail well outside the anvil of one of these beasts - even to the extent that the hail "curtains" are lit up by the westering sun and produce "hailbows."

http://myzone.saferetirementst.netdn...302.jpg?135282

Now, that's at ground level - I have no idea what the updrafts can spit out, and how far, at cruise level.

Just flew into Denver today (as pax) and we were dodging supercells that towered above us even at FL360.

As to the apparent disparity in damage - well, glass is glass, and I'm betting most of the paint removal on the radome was simply the thin aerodynamic shell flexing under the impacts and popping the paint loose.
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Old 9th Aug 2015, 04:22
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Typical of media reporting, the aircraft was reported, on the video I saw, as a 747. And it was brought in on the skill of the tower controllers.
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Old 9th Aug 2015, 05:56
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Still lots to learn about TRW deviations and Radars

Another fortunate successful diversion landing after a hail encounter. Thankfully we also have good autoland systems. But apparently, there is still more to learn about WX deviations, TRWs, radar characteristics, and radar performance. Even some of the the most recent WXRs, in the latest production jets, still have known "issues", and require care in their use. Anybody know which WXR they were using on this A320?

[Ref: Hail encounters... from Southern 242; DC-9-31; N1335U; executed a forced landing on a highway in New Hope, Georgia, United States after suffering hail damage and losing thrust on both engines in a severe thunderstorm on April 4, 1977, ....to the more recent B747-400 N664US "Spirit of Beijing" crossing the NoPac, into Korea].
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Old 9th Aug 2015, 07:12
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Pattern_Is_Full

Looking at the amount of damage that radome has suffered I would say that what you can see is actually the face of the radar dish itself.

Have a look at this picture of an a320 undergoing a major maintenance check. With the nose lifted up to allow access to the radar and look at the protector strips (not sure of the exact technical name sorry, but thats what they're for ) of the bottom one which is exactly in the middle at the top of the radome on this picture, and compare them to how much they have been bent and warped in the damaged photo.




It looks to me by the ammount that these have been bent that the radome has actually been punctured allowing access to the radar dish.

Regards

Speedbird
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Old 9th Aug 2015, 08:18
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I'm surprised they parked at a terminal gate in full view of the public.

Not a good look.

A remote gate may have been a better idea.....
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Old 9th Aug 2015, 10:42
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According to the same guy that took the picture, he referenced a 'sort of hole' above the engine where lightning struck.

Delta Airlines flight from Boston lands in Denver after hail damage | Fox News
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Old 9th Aug 2015, 15:01
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Speedbird - I think you're correct.
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Old 9th Aug 2015, 15:12
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Speedbird

They are lightning diverter strips, or that is what I have always known them as anyway. I also suspect that you are correct, and that the radome has been completely punched through and the scanner is visible.
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Old 9th Aug 2015, 16:47
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Radome depression has a nice circle on it. Radome pushed back into antennae would be my guess. Hole shows the antennae.
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Old 9th Aug 2015, 18:11
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I think the hail-damage on the Easy 737 was worse. Any images of the leading edges on this one?

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Old 9th Aug 2015, 18:35
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Any images of the leading edges on this one?
If you look at the wing and inlets in the first photo - there isn't any obvious damage - maybe some small dents, but nothing like that Easyjet stab... I'm actually a bit surprised there isn't more visible damage to the wing and inlet leading edges.
I grew up in Southeastern Colorado - golf ball size hail was not particularly uncommon. And while I personally never saw anything much bigger than golf ball size, buddies experienced baseball size.
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